income tax nbc's kevin tibbles starts us off from there tonight. good evening. >> brian, 2013 is barely a month old and already 42 murders in the city of chicago. the latest has galvanized this city into taking action. >> no one gets a pass. >> reporter: today, chicago city officials went on the offensive. taking aim at gun violence by calling for background checks on gun buyers. >> loss of any child, in any community, in this city, is a loss to the entire city. >> reporter: moving 200 more officers from behind their desks to the streets. >> if i have to put a policeman here, 24 hours a day, 7 days a week, 365, we're going to make a point that this territory belongs to the community. >> i'm hadiya, year 2015. >> reporter: the victims have names and families. 15-year-old honor student, hadiya pendelton, has become the latest face of violence in this city. in sixth grade, she took part in an anti gang video. >> your job is to say no to gangs and yes to a great future. >> reporter: despite by laws that prohibit gunshots within city limits, more than a